Improvement in steam-generator safety-valves



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JOHN ABSTERDAM,

Lette/rs Patent No'. 86,341, dated Februar/ry 2, 186? or NEW YORK, N. Y.

IMPROVEMENT IN STEAM-GENERATOR SAFETY-VALVES.

The Schedule referred to in these-Letters Patent and making parl: of thesame.

To all whom fit ma/y conce/m 4 Be it known that I, JOHN ABSTERDAM, ofthe city, county, and State of New York, have invented a new andimproved Hydrostatic Safety-Valve; and I do hereby declare the followingto be a full, clear, and exact description thereof, which will enablethose skilled in the art to make and use the same, reference being hadto the accompanying drawing, forming part of this specification, inwhichdrawing- Figure 1 represents a longitudinal vertical section ofthis invention.

Figure 2 is asectional plan or top view thereof.

Similar letters indicate corresponding parts;

'lhe nature of this invention consists in the arrangement of a hollowlever furnished with or forming a hollow weight, in combination with avalve, and with a pipe extending down into the boiler, to the meanwater-level, and up through the valve, connecting with the hollow leverin such a manner that a hydrostatic safety-valve is formed, the' valvebeing held down in its seat by thev weight of the hollow lever, togetherwith the weight of the water filling the same, as long as the pressureof the steam does not exceed the desired limit, and the water in theboiler does not sink below the mean water-level or the mouth of thepipe, but as soon as the water in the boiler sinks below the meanwater-level, the water contained in the hollow lever and shell runs backinto the boiler, and thereby the valve is relieved and allowed to open.

An adjustable counter-weight serves to set the safetyvalve to anydesired pressure.

A represents the shell of asteam-boiler, to which is secured the seat cefor the valve b.

This valve connects, by a rod, c, with the fulcrumpin d, which has itsbearing in astandard, e, and it is bored out to receive the pipe fandthe tubular or hollow lever g.

The pipe f extends through the valve-seat down into the boiler, and itsmouth is at a level with ,the mean water-line of the boiler, so thatwhen the water in the boiler rises to or above the meanv water-line,said pipe is closed against the steam, but if the water in the boilersinks below the mean water-line, the pipe is open, and the steam fromthe boiler has free access to the same.

The hollow lever g connects, through the holes in the valve b, with thepipe f, and it is provided withv'aiollow shell, h, to which is attachedan air-valve, n,'so that when the steam is generated in the boiler, thepressure of the steam will canse the water to rise into the hollow leverg and shell h, and the weight of this Water, together with that of thehollow lever and shell, will hold the safety-valve down into its seat.But when the water' in the boiler sinks .down below the mean water-line,the steam enters the pipe f, hollow lever g, and shell h, causing thewater contained therein to How back into the boiler, and thesafety-valve, beingv relieved, is forced open' by the pressure ofthesteamin the boiler. p The rod c, which forms the connection betweenthe valve b and the lfulorum-pin d, extends beyond said fulcrum-pn, andit forms the support for therbalanceweight lc, which is made adjustableby a screw-thread, or in any other desirable manner.

This balance-weight serves to set the safety-valve to any desiredpressure, so that said valve acts precisely like an ordinarysafety-valve as long as the waterin the boiler is kept above the meanwater-line; but as soon as the water in the boiler sinks below the meanwater-line, the safety-valve is relieved, and the steam blows oii, thusrelieving the boiler from all dangerous pressure.

To allow the steam to rise with facility into the ho'llow shell h, whenthe water in the boiler sinks below the mean water-line, l have secured,in the interior ofthe hollow lever g and pipe f, an internal pipe,i,whieh rises up near to the top of the hollow shell, as clearly shownin iig. l ofthe drawing.

I do not claim broadly as my invention the arrangement of a hollowwater-weight, in combination with a safety-valve Abut What I claim asnew, and desire to secure by Letters Patent, is

1. A hydrostatic safety-valve, constructed with a hollow lever, g; and ahollow shell, h, in combination with a pipe, f, extending into theboiler, to the mean water-line, substantially as shown and described.

2. The balance-weight 7c, in combination with the hollow lever g, shell7L, valve b, seat a, internal pipe j,

and pipe f, all constructed and arranged substantially.

in the manner set forth'.

'JOHN ABSTERDAM. Witnesses:

HAUFF,

ERNEST F. KASTENHUBER.

